code: def mergeStats(self, other: "StatCounter") -> "StatCounter":
      if not isinstance(other, StatCounter):
          raise TypeError(
              "Can only merge StatCounter but got %s" % type(other)
          )
  
      if other is self:  # reference equality holds
          self.mergeStats(
              other.copy()
          )  # Avoid overwriting fields in a weird order
      else:
          if self.n == 0:
              self.mu = other.mu
              self.m2 = other.m2
              self.n = other.n
              self.maxValue = other.maxValue
              self.minValue = other.minValue
  
          elif other.n != 0:
              delta = other.mu - self.mu
              if other.n * 10 < self.n:
                  self.mu = self.mu + (delta * other.n) / (
                      self.n + other.n
                  )
              elif self.n * 10 < other.n:
                  self.mu = other.mu - (delta * self.n) / (
                      self.n + other.n
                  )
              else:
                  self.mu = (self.mu * self.n + other.mu * other.n) / (
                      self.n + other.n
                  )
  
              self.maxValue = maximum(self.maxValue, other.maxValue)
              self.minValue = minimum(self.minValue, other.minValue)
  
              self.m2 += other.m2 + (
                  delta * delta * self.n * other.n
              ) / (self.n + other.n)
              self.n += other.n
      return self
  
file_path: spark/python/pyspark/statcounter.py
imports: import copy
  import math
  from typing import Dict, Iterable, Optional
label_desc: Use image node_id 3 for calling the StatCounter obj's underlying member method code with example usage: obj.mergeStats(other) and returns: self